Device for forming shoes.



No. 776,596. y PATENTED DBG. '6, 1904.

F. A.'J0HNS0N.

DEVICE FOR FORMING CORES.

APPLIGATIQN FILED PEB, s, 190,4.

NO MODELA FRANK A. JOHNSON, OF AURORA, ILLINOIS, ASSIGNOR OF ONE-THIRD TO UNITED STATES v Patented December 6, 1904.

PATENT OEEicE.

JOI-IN F. WELSH, OF AURORA, ILLINOIS.

DEI/ICE FOR FOFIIVIING COPIES..

SPECIFICATION forming part of Letters Patent No. 776,596, dated December 6, 1904.

Application ileil February S, 1904:. Serial No. 192,492. lNo model.)

To all when@ 'llt 'n1/(ty con/ceram Be it known that I, FRANK A. JonNsoN, a citizen of the United States, residing at Aurora, in the county of .Kane and State of Illi nois, have invented certain new and useful Improvements in Devices for Forming Cores; of which the following is a spccilication.

rIhis invention relates to means for forming sand cores for use in making' castings; and the especial object of the improvements is to .form a core of green sand that is especially adapted for forming peripheral grooves in sheaves, pulleys, &c.

While I have shown and will describe my invention as adapted to making a core in the form of aiiat ring, it will'be apparent .that with minor modifications of my invention it may be utilized in forming other shaped cores :for various purposes, and I therefore do not wish to be limited to the device for forming merely annular cores.

Referring' to the accompanying drawings, which form a part of this application, I have shown my invention in the following' views.

Figure l is a view, partly in vertical section on line I l of Fig'. 2 and partly in elevation, of my invention complete. Fig'. 2 is a top plan View of the same. Fig'. 3 is a vertical section on the line 3 3 of Fig. 2; land Fig. 4 is a fragmentary detail in cross-section, on an enlarged scale, of a portion of the baseplate, which forms a part of my invention.

Referring to the drawings in detail, o represents'a metal plate in the shape of a ring' with an annular groove or chamber (d in its under side and with an arch a2 extending transversely of the upper side of said ring and connected with a centrally-arranged boss or hub d3, in which there is a vertical opening or bore ai and from the opposite sides of which extend horizontal lugs a. Extending downwardly through the bore ai' is a stem L, to the upper end of which is secured a knob L', and the lower end of said stem is threaded, as at b2. The threaded end of said stein is screwed into a threaded opening in the center of the cross-bar c, through the outer ends of which extend downwardly screws c, which are screwed into suitable openings in the posts d of a ring' (l, which is loosely arranged in and adapted to slide vertically and to be partially rotated in the channel or groove fr.' in the casting rz.. 'I he posts d extend upwardly through the slots ai', which are formed in the casting' a and. coml'nunieate with thc groove a/ and are spaced apart, as shown, the length of said slots being sufficient to permit a partial rotation of the arms c.

'lo be used with the parts above described is a base-plate (a, which is formed with a central bore e and with an annular horizontal flange e and with vertical annular flange c3, which extends upwardly from the upper sur face of the horizontal flange. Adjacent to the vertical AIiange c an annular groove a" is formed in the upper face of the flange c2, on the outer edge of which an annular rib all as clearly shown in Fig. f1.

In using my improved device I lirlnly press the plate n into a bed of suitable moldingsand slightly dampened, and thereby lill the annular g'roove d below the ring (il. I then lift the plate with the sand compressed in it, as aforesaid, and the ring by grasping the knob 7) and place it over the base-plate e with the lower edge of the vertical Yflange a of the plate a iitting into the groove e" of the baseplate. VBy turning' the plate a on the baseplate e I slick the under side of the core held in the groove a, and by turning the crossbars c to the extent permitted by the slots d" I slick the upper side of said core, thus making it smooth on both surfaces. I then grasp the lugs ci and allow the ring d to drop by gravity, and thus force out the core from the groove d in the position on the pattern re quired for the casting' operation.

It will be seen from the foregoing' that the core is compressed in the chamber or g'roove formed therefor in the plate e, and therefore when it leaves the device it is in smooth and perfect condition, and because of the pressure to which it has been subjected will retain its shape under the conditions to which it may be subjected in the casting' operation. I have found in actual practice that a green-sand core formed as stated produces a smooth and true annular groove in a pulley or sheave and avoids expensive and troublesome operations in the casting of such devices by the methods usually employed.

Having thus described my invention, what I claim as new, and desire to obtain by Letters Patent, is-

l. In a core-forming device, a plate having an annular groove in its under side and provided with a suitable handle on its upper side, a ring itting loosely in said groove, and means for raising and for partially rotating said ring in said groove.

2. In a core-forming device, a plate having an annular groove in its under side, and having slots communicating' with said groove, a ring loosely litting said groove and having portions projecting through said slots, means for operating said ring, in combination with first-named plate Will be centered on said baseplate.

In testimony whereof I aiX my signature in presence of two witnesses.

FRANK A. JoHNsoN.'

Vitnesses:

F. BENJAMIN, J. F. WELSH. 

